A Villain broke the dimensions of heroes/villains and dragons. The Class 1-A went to investigate a forest. They found a cub dragon tied with a rope hanging it with a splinter that held the rope on the floor near a river it was a trap that the hunters made to find the mother of the dragons to hunt it.

Aizawa "Poor dragon. Just ignore it..."

Iida "Oh, lets help it is just a cub."

Deku "Please?" he approaches the cub a little carefully touching the head